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GENERAL SCIENCE - ELEMENTS AND METALS MCQs

Total Questions : 70 | Page 4 of 7 pages
Question 31. . Carbon, diamond and graphite are together called
  1.    allotropes
  2.    isomers
  3.    isomorphs
  4.    isotopes
 Discuss Question
Answer: Option A. -> allotropes
Question 32. . Permanent hardness of water may be removed by the addition of
  1.    sodium carbonate
  2.    alum
  3.    potassium permanganate
  4.    lime
 Discuss Question
Answer: Option A. -> sodium carbonate
Question 33. . The most important ore of aluminium is
  1.    galena
  2.    calamine
  3.    calcite
  4.    bauxite
 Discuss Question
Answer: Option D. -> bauxite
Question 34. . Soda water contains
  1.    carbonic acid
  2.    sulphuric acid
  3.    carbon dioxide
  4.    nitrous acid
 Discuss Question
Answer: Option C. -> carbon dioxide
Question 35. . Most soluble in water is
  1.    camphor
  2.    sulphur
  3.    common salt
  4.    sugar
 Discuss Question
Answer: Option D. -> sugar
Question 36. . Which of the following was to be discovered first in the chromospheres of the sun ?
  1.    Krypton
  2.    Xenon
  3.    Neon
  4.    Helium
 Discuss Question
Answer: Option D. -> Helium
Question 37. . Which of the following is in liquid form at room temperature?
  1.    Lithium
  2.    Sodium
  3.    Francium
  4.    Cerium
 Discuss Question
Answer: Option C. -> Francium
Question 38. . From which mineral is radium obtained?
  1.    Rutile
  2.    Haematite
  3.    Limestone
  4.    Pitchblende
 Discuss Question
Answer: Option D. -> Pitchblende
Question 39. . Which of the following are the ingredients of gun metal?
  1.    Iron, Zinc, Titanium
  2.    Iron, tin
  3.    Iron, Brass, Tin
  4.    Copper, Tin
 Discuss Question
Answer: Option D. -> Copper, Tin
Question 40. . Sodium metal is kept under
  1.    petrol
  2.    alcohol
  3.    water
  4.    kerosene
 Discuss Question
Answer: Option D. -> kerosene

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